Obama attempted to move control of the Census Bureau from the Commerce Department to the White House, to be managed by then Chief of Staff Rahm Emmanuel. 6. Obama had provided under the radar amnesty to illegal immigrants by allowing ICE Director John Morton to prohibit ICE officers from enforcing US immigration laws.
The primary enzymes responsible for DNA replication are DNA polymerases. Understanding the activity and limitations of DNA polymerases help in making sense of why DNA replication occurs the way it does. Key points are: 1  Prokaryotic cells contain three different DNA polymerases.2  Each have slightly different activities.uring DNA replication a DNA double helix must unwind and separate so that DNA polymerase enzymes can use each single strand as a template for the synthesis of a new double strand. Strand separation is catalyzed by a Helicase enzyme.
DNA polymerase has a remarkably high fidelity, thanks to its built-in proofreading and error-correcting facility. Synthesis of Primers. The DNA polymerase enzyme is incapable of synthesizing a novel strand from scratch -- it is able only to add nucleotides to the 3' end of already-present nucleotides.